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En8 Material Chemical Composition, Physical Properties For En-8

En8 Is A British Standard Grade. En-8 Comes From British Standa / BS 970 Part 3. This Is A Carbon Steel.  According to Bs 970/1991 (Part 3), En8 / 080M40 has 5 (Five) Chemical Elements. Also there 4 (Four) Conditions For Mechanical / Physical Properties. 830 Celsius to 860 Celsius temperature need for Normalizing.

Currently En 8’s new name 080M40.

830 Celsius to 860 Celsius temperature need for Normalizing. For Materials Hardening treatment, You must need 830 Celsius to 860 Celsius temperature and for Tempering, the temperature must need 550 Celsius to 660 Celsius.  Oil used as a Quench medium for this material.

Chemical Composition For En-8 / 080M40 Carbon Steel

Chemical ElementsSpecified Value For EN 8 / 080M40 Material
Carbon          (C)0.36 To 0.44 %
Manganese  (Mn)0.60 To 1.00 %
Silicon          (Si)0.10 To 0.40 %
Sulphur         (S)0.050 % (Max.)
Phosphorus  (P)0.050 % (Max.)

Mechanical / Physical Properties For En 8 / 080M40 Carbon Steel

Sl. No.ConditionSize (Diameter Across Flats Or Thickness)Tensile Strength N/Mm2
( Min.)
Yield Stress N/Mm2 ( Min.)Percentage Elongation, Minimum At Gauge Length 5.65 √S0
1Normalized + Turned Or Ground 6 To 15055028016
  > 150 To 25051024517
2Hot Rolled + Cold Drawn Or Hot Rolled + Cold Drawn + Ground 6 To 136605307
  > 13 To 166505108
  > 16 To 406204809
  > 40 To 6360046510
  > 63 To 7657043010
3Hardened And Tempered + Turned Or GroundQ  6 To 63625 To 77538516
  R  6 To 19700 To 85046516
4Hardened And Tempered + Cold Drawn Or Hardened And Tempered + Cold Drawn + GroundQ  6 To 63625 To 77543512
  R  6 To 19700 To 85049012

Hardness And Impact Properties For En-8 / 080M40 Carbon Steel

Sl. No.ConditionSize (Diameter Across Flats Or Thickness)Hardness ( BHN )Impact (J)
Izod
( Min.)
Impact (J)
KCV
( Min.)
1Normalized + Turned Or Ground 6 To 150152 To 2072016
  > 150 To 250146 To 197
2Hot Rolled + Cold Drawn Or Hot Rolled + Cold Drawn + Ground 6 To 13
  > 13 To 16
  > 16 To 40
  > 40 To 63
  > 63 To 76
3Hardened And Tempered + Turned Or GroundQ  6 To 63179 To 2293428
  R  6 To 19201 To 2553428
4Hardened And Tempered + Cold Drawn Or Hardened And Tempered + Cold Drawn + GroundQ  6 To 63179 To 22934 
  R  6 To 19201 To 25534 

Hardening, Normalizing And Tempering Parameters For Free-Cutting En 8 / 080M40  Carbon  Steel

Hardening Treatment Temperature (Celsius)Hardening Treatment Quench mediumTempering temperature (Celsius)Normalizing temperature (Celsius)
830 To 860 °COil550 To 660 °C830 To 860 °C

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